Funny, I grew up barrel racing as a kid, and my horse riding ended because of a bareback trail-ride.
Our racing horses weren't used to trails and all the surprises nature can throw at you, so when a mass of birds decided to leave a tree at the same time, it startled our horse, which stood straight up.
I was riding on our horse with my stepsister, gently hanging on to her from behind. When the horse stood straight up, I rolled right off the back and landed sideways on my neck. I thought I was paralyzed for several minutes, but then decided to walk and take up rollerblading as a hobby.
My only problem was wrangler jeans didn't look good with rollerblades.